ngrx change detection strategy on dummy components

Question

I'm having a look to the example-app defined in the ngrx repo: https://github.com/ngrx/platform/tree/master/example-app

I can see that the ChangeDetectionStrategy.OnPush property is set only on "container" components while dummy components don't override the default change detection strategy.

Can anyone explain the reason? I would expect all the components in the application to use ChangeDetectionStrategy.OnPush

Thanks,

Gab

Answer 1

There's no need to set ChangeDetectionStrategy.OnPush on every component as setting it on a parent component disables checking for the entire branch.

comp1 (ChangeDetectionStrategy.OnPush)
   comp2        <--- won't be checked
     comp3      <--- won't be checked

For more information on ChangeDetectionStrategy, read:

• Everything you need to know about change detection in Angular

• If you think ngDoCheck means your component is being checked — read this article